Technical Note: Auxiliary Electrode Method for Determination of Ohmic Resistance Available to Purchase

The influence of uncompensated ohmic resistance on the interpretation of electrochemical polarization data and on the scan rate in potentiodynamic experiments has received considerable attention in recent years.^1,4  A number of thorough reviews exist on techniques for measurement of the ohmic resistance.^5-7  One technique that has become popular and is used fairly widely is the current interruption method. The interruption method was pioneered by Hickling In 1937⁸  and modified by Salt in 1947⁹  to address the criticisms raised by Frumkin.¹⁰  It was used extensively by Schuldiner and coworkers In the US for a variety of corrosion and electrochemical investigations beginning in 1950.¹¹  Automated correction using this technique is currently available on several commercial potentiostat systems. The current interruption method involves (1) interrupting the current at a desired current value with the aid of a fast switch that is usually in series with the counter...